Electrical code transmitter



Nov. 26, 1929. w. c. ROE 1,737,024

ELECTRI CAL CODE TRANSMITTER Filed Sept. 11, 1926 2 Sheets-Sheet 1INVENTOR Nov. 26, 1929. w. c. ROE

ELECTRICAL CODE TRANSMITTER Filed Sept. 11 1926 2 Sheets-Sheet lllll Illl G mm mm Inn lull

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Hu l Ill! INVENTOR {0M9 M BY'\ 0! X ATTORNEY Patented Nov. 26, .1929

UNITED STATES PATENT OFFICE WILLIAM C. ROE, OF PITTSBURGH, PENNSYLVANIA,ASSIGNOR TO PRINTEL MANU- FACTURING CORPORATION, A CORPORATION OF NEWYORK ELEC RICAL con-n TRANSMITTER Application filed September 11; 1926.Serial No. 134,884. 7

My invention relates to improvements in electrical code instruments andrelates more particularly to code instruments of a type adaptable foruse in connection with printing telegraph systems. p

An object of my invention is to provide an improved electrical codetransmitter employing a keyboard, comprising keys by the manipulation ofwhich current impulses may be produced in an electrical signalingcircuit in a highly eflicient manner.

Another object of my invention is to accomplish the production ofcurrent impulses in an electrical signaling circuit by the operation ofhighly improved positively operating apparatus.

Another object of my invention is to dispense with the multiplicity ofcontact sets heretoforecommonly provided for the purpose of producingcurrent impulses in a signaling circuit, eachof their contact sets beingassociated with one of the plurality of signaling keys provided.

Another, object of my invention is to provide a mechanism of the abovecharacter in which a selected impulse sending element is started inoperation by merely depressing a key associated with such element andwhereby the element will complete its cycle of operation, regardless ofthe period of time the key is depressed.

Other objects of my invention comprise features of improvement of themechanism herein described and such and other objects 'of my inventionwill become apparent as the following description of an embodiment of myinvention progresses, and in which description reference will be had tothe accompanying drawings illustrating such embodimentfl Referring tothe figures of the drawings:

Fig. 1 is a side elevation of the'leftend of my telegraphic transmittingapparatus;

. Fig. 2 is a similarview of the right hand end of the apparatus;

Fig. 3 is a top plan view of the apparatus reduced one-half the size ofthe actual apparatus;

Fig. 4 1s a front elevation of the same;

' able manner.

arranged parallel to each other on different planes, and rigidly securedin any suitable manner to a pair of vertically disposed side plates '6and 7. Preferably the frame sections are secured together by means of aseries of screws 9 to. enable the apparatus to be disassembled withlittle difliculty.

The horizontal bars 1, 2, 3, 4 and 5, referred to, are adapted forvarious other functlons 1n this apparatus aside from supporting thevertical side plates 6 and 7, which functions will be more fullydescribed in other portions of the specification.

Referring particularly to Fig. 3 of the drawings, I have provided ahollow shaft journaled to rotate in, preferably, ball bearing races 12,mounted in any suitable manner in the side plates 6 and 7. The shaft 13is hollow to provide a chamber 76 for the reception of a lubricant andwill be more fully described in a later portion of the specification.Carried by the hollow shaft 13, and nestled together by fasteners 17 and18' at each end of the hollow shaft in any suitable manner topreventlateral displacement, I have provided a plurality of slotted disks 14locked into engagement with the hollow shaft 13 when any one'of the keysin the bank of the standard typewriter keyboard 16 is deshaft and theslotted disks 1a and the cam wheel 15 are interlocked with the hollowshaft 13 thereby causing rotation of the entire unit.

The hollow shaft 13 is rotated in any suit- One of the preferred formsadopted receives its power preferably from the hollow shaft 13 looks thepawl 31 to the i an electric motor, not shown, which drives theintermediate gears 41 and 42 journaled in the side plate 6 of the frame.The intermediate gear 42 is meshed with gear 43, secured to the hollowshaft 13 and imparts rotary motion to the shaft 13 when'the electricmotor is in operation.

The slotted disks 14 and cam faced wheel 15 are normally disconnectedand are connected through the pawl 31 and ratchet wheel 37.

The standard key levers 21 are pivoted to the horizontal cross bar 5 andare guided in vertical slots formed in the horizontal plate 2, to limitthe downward movement of the keylevers 21 when the same are depressed. Astop plate 26 is disposed above the series of key levers 21 to limit theupward travel of the key levers 21 by the force exerted by the coilspring 27 Connected to the key levers 21 near their pivots are upwardlyextending curved links 23 (Fig. 5). The adjustable links 23 are bent atangles upwardly and to the right and left with respect to each of thelevers 21.- Adj ustment-of the links 23 is obtained by screw threadingthe upper ends. In this way the length of the curved links 23 may varythe pull on. the levers 24 to which their upper ends are secured by anadjusting nut 25.

Pivoted to the horizontal bar 3, at 28, are a plurality of horizontallevers 29 supporting an upwardly projecting escapement finger 30 andadapted to pivotally support the locking lever 24, at 81, substantiallyat their centers. The inner end of the lever 24 is provided with anupwardly extending locking finger 32 which is forced upwardly into theslot 34 of the disk 14 in a manner which will be hereinafter more fullydescribed. The outerend of the levers 24, adjacent to screw 25, carriesan upwardly extending lug 39 to which coil springs 40 are secured. Theupper ends of the coil springs 40 are anchored in any suitalgle mannerto the horizontal bar 1, of the frame.

Screwed into the side plate 8 is a horizon-.

tally adjustable bearing 44 provided. on its inner face with a concavewearing. surface 45.

In a like manner a similar bearing 46 is disposed in the plate 7 indirect alignment with the bearings 45 and having its wearing face turnedtowards that of the wearing face 45 of bearing 44. Supported in thebearings 44 and 46 is a horizontal shaft 47 having pointed ends 48 and49.3vhich are inserted into the bearing faces 45 so as to reduce anyfriction between the bearings 44 and 46 and the shaft 47 as much aspossible.

Keyed at 50, ("'Fig. 5) to the shaft 47 are a multiplicity of inwardlyprojecting contact fingers 51 each provided with a roller 52 journaledtherein, and disposed above the cam wheels15. I

Adjacent the pointed end 49 of the shaft 47, a contact lever 53 issecured to the shaft 47 and is adapted to close the spring contact arms54 and 55. The spring contact arms 54 and 55 are fastened to aninsulating plate 56 which is carried by an adjustable plate 58 adaptedto I be rotated about a pivot 59 on the side plate 7.

This plate can be forced to the right by rotating the set screw 60 inthe projection 61 on the side plate 7, against the tension of a spring62 fastened at 63"to the side plate 7. Then it is desired to increasethe angular adjustment of the spring arms 54 and 55 with respect toReferring to Fig. 5 in the drawings, I have shown the hollow shaft 13provided with a series of small bores 77 on the upper face of the shaft.These bores are disposed'in alignment with each one of the slotted disks14 in such a manner that when the shaft 13 is rotated the lubricantcontained in the hollow portion 76 of the shaft 13 may find a passagethrough the bores 77and lubricate the sleeve holding cam 15 and slotteddisc 14 as lubrication is required. The lubrication chamber 76 isprovided with screw caps 75 and 78 at each end so that the lubricant maybe replenished as required.

Referring now to the operation of my transmitter, a more comprehensiveunderstanding may -be had by reference to the schematic Fig. 5, of thedrawings. All the units are similar to the combination shown in thisfigure with the exception of the indentations on the periphery of thecams. Inasmuch as all the units are alike the operation of one unit willnow be described, it being understood that a group of these unitsisassembled on a common shaft and disposed parallel with each other. I

comprising a complete unit comprises a key lever 21, a connecting link23, a set of escapement fingers 29 and 24, a ratchet wheel 37, a pawl31, a slotted disk 14, a cam 19, a drive shaft 13, a contact finger 51,a finger shaft 47 a contactarm 5 3. and a set of contact springs 54 and55. c The shaft'13 is driven in any suitable way, such as by anelectricmotor, and keyed to the shaft is a ratchet wheel 37, which revolves withthe shaft at all times. Closely associated with the ratchet wheel onshaft 13 is a cam 19 slotted disk 14 and a pawl 31 which as shown inFig. 5 is combined as one unit on a sleeve. This unit is loosely carriedon the drive shaft and 1s .held stationary by theescape fingers when Asheretofore described the combination projection 80 on the pivot end ofthe pawl is ried around with the rotating shaft 13. If

now, the finger is released before one revolution of the disk takesplace, the end of the finger will come into contact with, and ride onthe edge of the disk, until such a time as it reaches the slot in thedisk and the pawl thereon. Just before the end of the finger againenters the slot it willengage the angle portion 80 of the pawl, which atthis time covers the slot due to its bein in engagement with the ratchetwheel and, therefore, tipped at a greater angle, and will carry thesameback and parallel with the'slotx The pawl is thus disengaged from theratchet wheel and the finger permitted tore-enter the slot,-

thereby locking the disk and cam against further rotation. Thisoperation obtains when the finger 29 is released before one revolutionof the shaft '13 is completed, since if the finger 29 is held away fromthe disk for a greater period of time, the cam unit would make more thanone revolution which is not desirable. The escapement action of the twofingers 29 and 24 and the pawl 31, provides for automatically insuringcorrect operation in this respect. The finger 29 is pivoted at 28 at'itsend, opposite the disk; the finger 24 is pivoted on the finger 29 at81 about midway of its length. The right hand end of finger24, adjoiningthe disk, is angularly so disposed and shaped as is the end of finger 29so as to permit it to enter the slot in the disk and engage the end ofthe pawl, under certain conditions'when obtained. The opposite end ofthe finger is bifurcated, on'e fork thereof, 39, being curved upwardlyand at its end is secured an end of a helical restoring spring 40,attached at its other end to a support 1, and disposed to exert anupward etl'ort substantially in a direction at right angles to the mainportion of the finger 29. The other fork 82 extends toward the pivot 28.The adjustable link 23 forms the finger 29 will remain in its normalposition, due to the relative positioningof the parts, the upward pull'of the spring 40 being exerted on a three point suspension,namely, thepivot rod 28 at one end, the disk at the opposite end and the pivot offinger 24 at its center. comes into contact with the disk, the link 23is moved farther downward by depression of the key lever 21, the pivotpoint of finger 24 will be moved downward also, the end If, after theend of the finger 24 of the finger in contact with the disk acting as apivot.' As the finger 24 is pivoted on finger 29, this operation willcause finger 29 to be-drawn down and rotated on its pivotrod 28 in theleft-hand end. This movement of finger 29 will effect the withdrawl ofits end 30 out of the slot 34 in the disk and free the disk 14. At themoment the finger is withdrawn from the slot 34, the pawl will be springpressed into engagement with the ratchet wheel, and thus the cam unitwill be rotated by the drive shaft. lVhen one revolution thereof isnearlycompleted and the finger 24 is held against'the disk by the.pressure on the key lever, the end 32 of the finger 20 will enter theslot 34 and efiect the disengagement of the pawl from the ratchet wheel,thus locking the cam'unit as mentioned before. Now, the pressure on thekey 21 being removed and the key returned to its normal position, thespring 40 will raise finger 29 into contact with the disk, after whichwith a continued upward movement finger 24 will be withdrawn from theslot 34 and through the operation of the pawl and ratchet wheel the camunit will be advanced until finger 29 enters the slot 34 and againreleases the pawl and locks the cam unit. The arrangement of theescapement as a whole is such that the cam unit will make but onerevolution for each complete operation of I the key lever, regardless ofthe length of time that the key lever is held in a down may be of thetype common to all typewriters and requires no explanation. The camsection of the unit just referred to has a toothed edge, the teeth beingso disposed thereon as to operate the contacts 54 and 55 according tothe impulse code to be transmitted by that particular cam. In contactwith and 0p erated by the toothed cam is one end of a contact finger 51,this end of which holds a roller 52 for the reduction of frictionbetween the finger and the cam. As shown 'in Fig. 5, the fingerisconstructed with a hole through the opposite end through which passes afinger shaft 47. An adjusting screw 79 is preferably provided in the endprojecting beyond the shaft 47 The'finger has aslot 83 throughout itslength receiving the roller 52 at its one end and a pin 84 rests withinthe slot at the other end of the finger. The finger is loosely mountedupon the shaft 47 and directly in line with the slot, a hole being cutthrough the shaft at right angles thereto,

" into which is secured the pin 84. a The slot 83 cam is rotated theirregular surface ofthe cam will cause the finger to be intermittentlyraised to impart movement to the shaft through the screw and pin 84, butin the case where two or more like cam units are mounted upon the sameshaft, the operation of one cam and finger unit will not affect theothers, as the shaft 47 can be rotated in a clockwise direction by anyone unit and through the non-functioning of the screws and pins, theothers will remain stationary.

' Thus, a series of impulses are communicated to the contacts 54 and 55through contact arm 53 from one'of a number of camv units withoutinterference. .The Contact arm 53 secured on shaft 47 causes thecontacts 54 and 55 to be operated responsive to movements of anyselected finger riding on the irregular surface of a cam. Thisconstruction makes it possible to use but one set of electricalcontactsfor an indefinite number of characters, resulting in acomparatively simple but positive impulse transmitter.

In operating the transmitter, the depression of any key will cause thecam associated with that key to make one revolution. Each cam, having adifferent series of teeth on its edge, will cause its associated contactfinger tooscillate the finger shaft, which in turn will close and openthe set of contacts 54 and in unison therewith. .In this way the desiredseries of impulses, corresponding with any character, can be transmittedover a wire.

It will be understood from the foregoing that the depression of one ofthe keys of the keyboard and its associated levers and cam wheel willcause this one cam wheel to be locked to the hollow supporting shaft androtated thereon. The ad acent-finger will be vibrated and oscillated onthe finger shaft independently of the other fingers to close the contactat 53 and 54 by .virtue of the fine individual adjusting pin and screwcarried by each finger. Q1. 2

. Having thusd my invention in 9.-

specific embodiment, I am aware that numerous and extensive departuresmay be made from the, invention herein illustrated and described'butwithout departing from the spirit of my invention. I claim 1. In anelectrical impulse sending mechanism, the combination with a set ofelectrical contacts, of a plurality of means for operating said contactset, said means comprising a rod, a plurality of lever arms extendinglaterally from the rod and secured thereto, a rotatable shaft disposedparallel 'with the rod, a plurality of impulse wheels on the shaft, aclutch for each impulse wheel, said clutch comprising a clutch elementkeyed'to the shaft and rotatable therewith, a second clutch elementadapted to cooperate with the first clutch element to efiect drivingengagement between the shaft and its associated impulse wheel, a key for*each set of clutch elements adapted to initiate the clutchingoperatiori thereof, and means responsive independently ,of the continuedoperation of said key adapted upon a predetermined rotative movement ofan impulse wheel to disable its associated clutch, one of said leverarms extending from the rod to the said contact set to communicateoperative movements thereto, the 'other said lever arms each extendingto one of the said impulse wheels and having a portion contactingtherewith to receive rocking movements therefrom as the wheel is rotatedresponsive to operation of its associated clutch, rocking movementsimparted to any of said lever arms imparting similar rocking movementsto said first lever arm to operate the contact, set.

2. In an electrical impulse sending mechanism, the combination with aset of electrical contacts, of a plurality of means for operating saidcontact set, said means comprising a rod, a plurality of lever armsextending laterally from the rod and secured thereto, a rotatable shaftdisposed parallel with the rod, a plurality of impulse wheels on theshaft, a clutch for each impulse wheel, saidclutch com rising a clutchelement keyed to the sha t and rotatable therewith, a second clutchelement adapted to cooperate with the first clutch element to effectdriving engagement between the shaft and its associated impulse wheel, akey for each set of clutch elements adapted to initiate the clutchingoperation thereof, and means responsive independently of the continuedoperation of said key adapted upon a predetermined rotative movement ofan impulse wheel to disable its associated 1 clutch, one of said leverarms extending from therod to the said contact set to communicateoperative movements thereto, the other said lever arms each extendingto-one of the said impulse wheels and having a portion contactiifgtherewith to receive rocking movements therefrom as the wheel is rotatedresponsive set, means associated with each said key adapted to lock itsassociated impulse wheel in a given rotative pos1t1on,sa1d means beingresponsive to an operative'movement of said key to disable said lockingmeans.

3. In an electrical impulse sending mechanism, the combination with aset of electrical contacts, of a plurality of means for operating saidcontact set, said means comprising a rod, a plurality of lever armsextending laterally from the rod and secured thereto, a rotatable shaftdisposed parallel with the rod, a plurality of impulse wheels on theshaft, a clutch for each impulse wheel, said clutch comprising a clutchelement keyed to the shaft and rotatable therewith, a second clutchelement adapted to cooperate with the first clutch element to effectdriving engagement between the shaft and its associated impulse Wheel, akey for each set of clutch elements adapted to initiate the clutchingoperation thereof, and means responsive lndepend- -ently of thecontinuedoperation of said key adapted upon a predetermined rotativemovement of an impulse wheel to disable its associated clutch, one ofsaid lever arms extending from the rod to the said contact set tocommunicate operative movements thereto,

the other said lever arms each extending to one of the said impulsewheels and having a portion contacting therewith to receive rockingmovements therefrom as the wheel is rotated responsive to operation ofits associated clutch, rocking movements imparted to any of said leverarms imparting similar rocking movements to said first lever arm tooperate the contact set, means associated with each said key adapted tolock its associated im.-

pulse wheel in a given rotative position, said means being responsive toan operative movement of said key to disable said locking means, asecond impulse wheel locking means conditioned to lock the wheelresponsive to the operation of the key to effect rotation of the wheel,and means carried by the wheel adapted to cooperate with said secondlooking means therefor to effect the locking of the wheel after a givenpredetermined rotation thereof.

4:. In an electrical impulse sending mechanism, the combination with-aset of electrical contacts, of a plurality of means for operating saidcontact set, said means comprising a rod, a plurality of lever armsextending laterally from the rod and secured'thereto, a rotatable. shaftdisposed parallel with the rod, a plurality of impulse wheels on theshaft, a clutch for each impulse wheel, said clutch element adapted tocooperate with the first sociated clutch, one of said lever armsextending from the rod to the said contact set to communicate operativemovements thereto, the other said lever arms each extending to one ofthe said impulse Wheels and having a portion contacting therewith toreceive rocking movements therefrom as the Wheel is rotated responsiveto operation of its associated clutch, rocking movements imparted to anyof said lever arms imparting similar rocking movements to saidfirstlever arm to operate the contact set, said key means comprising-a pairof levers, both of said levers having contact portions projected intothe path of the rotatable wheel associated with said key, one of saidlevers pivoted at an intermediate point on the other lever, the otherlever being pivoted at a point thereon disposed at an opposite side ofthe pivot point for the first lever from its contact portion, and re-'tractile means adapted normally to hold the contact portion of the firstlever out of en.

gagement with the wheel and to hold said other lever contact portion inengagement with the said wheel.

5. In an electricalimpulse sending mechanism, the combination with a setof electrical contacts, of a plurality of means for operating saidcontact set, said means comprising a rod,

7 a plurality of lever arms extending laterally from the rod and securedthereto, a rotatable shaft disposed parallel with the rod, a pluralityofimpulse wheels on the shaft, a clutch for each impulse wheel, saidclutch comprising a clutch element keyed to the shaft and rotatabletherewith, a second clutch element adapted to cooperate with the firstclutch element to effect driving engagement between the shaft and itsassociated impulse wheel, a key for each set of clutch elements adaptedto initiate the clutching operation thereof, and means responsiveindependently of the continued operation of said key adapted upon apredetermined rotative movement of an impulse wheel to disable itsassociated clutch,

one of said lever arms extending from the rod to the said contact set tocommunicate operative movements thereto, the other said, lever arms eachextending-to one of the said impulse wheels and having a portioncontacting therewith to receive rocking movements therefrom as the wheelis rotated responsive to operation of its associated clutch; rocking'movements imparted to any ofsaid lever arms imparting similar rockingmovements to said first lever arm to operate the contact set, said keymeans comprising a pair of "levers,

associated with said key, one of said levers,

pivoted at an intermediate point on the other lever, the other leverbeing pivoted at a point thereon disposed at an opposite side of thepivot point for the first lever from its contact portion, and retractilemeans adapted normally to hold thecontact portion of the first lever outof engagement with the wheel and to hold said other lever contactportion in engagement with the said wheel, said key means comprising akey portion adapted to transmit a manually applied key operating impulseto the said first lever to move it into engagement with the said Wheel,said other lever being responsive \tothe engagement of the first leverwith the wheel upon continued pressure being applied to the key means towithdraw its contact portion from engagement with the wheel.

6; In an impulse sending mechanism, the combination with a plurality ofimpulse Wheels, a plurality ofmanually operable keys of the typewritertype, each of said keys associated with a different one of said wheels,of a common set of electrical contacts for all said wheels, and meansresponsive to the depressing of one of said keys to rotate a selectedwheel to actuate said contacts in accordance with the form of the wheelassociated with said key, and means operable independently of thecontinued manual operation of said key, adapted to render said firstnamed means inoperative after a single series of impulses,characteristic of the said wheel, is communicated to the contact set.

7. In an impulse sending-mechanism, the combination with a plurality ofimpulse wheels, a plurality of manually operable keys of the typewritertype each of said keys associated with a different one of said wheels,of a common set of electrical contacts-for all said wheels, and meansresponsive to the depressing of one of said keys to rotate a selectedwheel to actuate said contacts in accordance with the form of the wheelassociated with said key, and means operable independently of thecontinued manual operation of said key, adapted to render said firstnamed means inoperative after a single series of impulses,characteristic of the said wheel,

is communicated to the contact set, said impulse wheels being normallystationary, and means to communicate rotative motion to a singleselected one'of said wheels effective on operation of its associatedkey,and means responsive to a predetermined rotative movement of thewheel to lock it against rotation. H Y I 8. In an impulse sendingmechanism, the combination with a plurality of impulse wheels, aplurality of manually operable keys of the typewriter'type, each of'said keys associatedwith a difierent one of said wheels,

of a common set of electrical contacts-for all said wheels, and meansresponsive to the depressing of one of said keys to rotate a selectedwheel to actuate said contacts in accordance with the form of the Wheelassociated with said key, and means operable independently of thecontinued manual operation of said key, adapted to render said firstnamed means inoperative after a single series of impulses,characteristic of the said wheel, is communicated to the contact set,said impulse wheels being normally stationary, and means to communicaterotative motion to a single selected one of said wheels effective onoperation of its associated key, and means responsive to a predeterminedrotative movement of thewheel to lock it against rotation, said lastnamed'means being adapted to be disabled by said key upon adiscontinuance of pressure applied to its key, and spring pressed meansadapted thereupon to restrain said wheel from operation independently ofsaid locking means.

9. In an impulse sender, the combination of a rotatable shaft, aplurality of impulse wheels loosely carriedon said shaft, a clutch foreach wheel adapted to clutch it to the shaft to efiect its rotation, aset of key contacts a linkage adapted to communicate motion from arotating one of said wheels to said contact set, and. manually operablekey means to operate a selected "one of said clutches,-said key meanscomprising a pair of levers for each wheel, one of said levers normallyin'locking engagement with said wheel, the other of said levers normallyout of engagement with said'wheel, said key means adapted to discontinuethe locking en-' gagement of said first lever vwith said wheel and tocondition'the second lever for locking engagement therewith, and meansoperative only after a predetermined rotative movefor each wheel adaptedto clutch it to the,

shaft to effect its rotation, a set ofkey contacts.a linkage adapted tocommunicate mo tion from a rotating one of said wheels to said contactset, and manually operable key means to operate a selected one of saidclutches, said key means comprising a pair of levers for eachwheel, oneof said levers.

normally in locking engagement with said wheel, the other ofsaidlevers-normally out of engagement with said wheel, said key meansadapted to discontinue the locking engagement of said first lever withsaid wheel and to conditon the second lever for locking engagementtherewith, and means operative l J only after a predetermined rotativemove-" ment ofthe wheel to permit locking engagement of the second leverwith the wheel, and means responsiveto the withdrawal of the first leverfrom locking position to operate said clutch, and means to render saidclutchoperating meanse disabled upon the locking engagement of saidsecond lever with the wheel.

11. In an impulse, sender, the combination of a rotatable shaft, aplurality of impulse wheels loosely7carried on said shaft, a clutch foreach wheel adapted to clutch it to the shaft to effect its rotation, aset of key contacts a linkage adapted to communicate motion fromarotating one of saidwheels to said contact set, and manually operablekey means to operate a selected one of said clutches, said key meanscomprising a pair of levers for each wheel, one of said levers normalyin locking engagement with said wheel, the other of said levers normallyout of engagement with said wheel, said key means adapted to discontinuethe locking engagement of said first lever with said wheel and tocondition the second lever for lock:

- ing engagement therewith, and means operative only after apredetermined rotative movement of the wheel to permit lockingengagement of the second lever with the wheel, and means responsive tothe withdrawal of the first lever from locking/position to operate saidclutch, and means to render said clutchoperating means disabled upon thelocking engagement of said second lever vwith the wheel, said secondlever pivoted at a portion intermediate the pivot and locking portion ofsaid first lever.

'- 12. In an impulse sending mechanism, the combination with a pluralityof impulse wheels, of a rotatable shaft carrying the said wheels, saidwheels being normally loosely mounted on the shaft, clutching means toclutch a selected one of said wheels to theshaft to efiect rotation ofthe selected wheel of a contact set responsive to a selection of a wheelto make and break an electrical circuit,

- in accordance with the particular wheel selected, said shaft having alongitudinal bore and ducts extending laterally from said bore to theexterior of the shaft adjacent each wheel, and closures for the bore atits ends, said bore adapted to contain a supply of lubricant for thewheels.

In testimony whereof I hereunto aflix my signature this 27th day ofFebruary, 1926. a I WILLIAM C. ROE.

